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Group II intron-based gene targeting reactions in eukaryotes.

Marta Mastroianni1, Kazuo Watanabe, Travis B White

  • 1Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, Texas, United States of America.

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Summary

Mobile group II introns can now be used for gene targeting in eukaryotes. Researchers optimized retrohoming efficiency in eukaryotic nuclei by increasing Mg(2+) concentrations, enabling applications in higher organisms.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Mobile group II introns facilitate site-specific DNA insertion via retrohoming.
  • This process involves intron-encoded proteins and RNA within a ribonucleoprotein particle (RNP).
  • Group II introns have been engineered as bacterial gene targeting vectors but not yet efficiently in eukaryotes.

Purpose of the Study:

  • To investigate the efficiency of group II intron RNPs in eukaryotic gene targeting.
  • To optimize retrohoming conditions for enhanced integration and DNA repair in eukaryotic systems.
  • To assess the potential of group II introns for gene targeting in various eukaryotic model organisms.

Main Methods:

  • Utilized a plasmid-based Xenopus laevis oocyte microinjection assay.
  • Manipulated Mg(2+) concentrations to optimize RNP integration efficiency.
  • Analyzed integration products for double-stranded DNA characteristics and assessed homologous recombination stimulation.
  • Tested targeting reactions in zebrafish and Drosophila embryos, including chromosomal targets.

Main Results:

  • Group II intron RNPs efficiently integrate into eukaryotic target DNA with increased Mg(2+), reaching up to 38% of plasmid targets.
  • Integration products confirm second-strand DNA synthesis by host enzymes.
  • RNPs stimulate homologous recombination up to 4.8% of target sites.
  • Chromatinization inhibits targeting, but DNA replication in zebrafish and Drosophila embryos mitigates this effect, allowing efficient integration into plasmid and chromosomal sites.

Conclusions:

  • Demonstrated efficient, Mg(2+)-dependent group II intron integration and gene targeting in eukaryotic nuclei.
  • Showcased successful application in Xenopus, zebrafish, and Drosophila, paving the way for higher organisms.
  • Established a foundation for developing group II intron-based gene targeting tools for eukaryotes.